Specifications
Aquastat Controllers
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L8124 Triple Aquastat® Relay
Immersion-type controllers that combine high limit protection with
low limit and circulator control in forced hydronic heating systems,
including domestic hot water service.
• Immersion-type controllers that combine high limit protection with
low limit and circulator control in forced hydronic heating systems.
• Provide multizone control by using a separate circulator and R845
Relay for each zone.
• Include diaphragm powerhead and Micro Switch™ assembly that
respond to temperature changes in boiler water.
• Mount directly to boiler.
• Select models include large transformers and extra terminals for
supplying power to low voltage zone valves.
• Require 24 Vac thermostat with heat anticipator set at 0.2 A (plus
current draw of gas valve on L8124E).
• TRADELINE models include tube of heat conductive compound and
range stops.
Voltage: 120 Vac
Maximum Ambient Temperature: 150 F at switches, 265 F at sensing
element. (66 C at switches, 129 C at sensing element.)
Operating Range, High Limit: 130 F to 240 F adj. (54 C to 116 C adj.)
Operating Range, Low Limit: 110 F to 220 F adj. (43 C to 104 C adj.)
Maximum Operating Pressure: 200 psi on outside of immersion well,
100 psi on capsule if inserted directly. (1378 kPa on outside of
immersion well, 690 kPa on capsule if inserted directly.)
Operating Humidity Range (% RH): 0 to 95% RH, non-condensing
Approvals:
Canadian Standards Association: Certified: File No. LR1620, Guide
No. 400-E-O
Underwriters Laboratories, Inc. UL Listed (models with well): File No.
MP466, Guide No. MBPR; UL Component Recognized (models
without well): File No. MP466, Guide No. MBPR2
Replacement Parts:
L7224U1002 120 Vac Oil Electronic Aquastat® Controller with
Enviracom communication and troubleshooting Leds
Vertical Vertical
Horizontal
Electrical Ratings
burner circulator
AFL ALR AFL ALR
L8124A
3.7 A @ 240 Vac;
7.4 A @ 120 Vac
22.2 A @ 240 Vac;
44.4 A @ 120 Vac
3.7 A @ 240 Vac;
7.4 A @ 120 Vac
22.2 A @ 240 Vac;
44.4 A @ 120 Vac
L8124B,
C, E, G, L
Line Voltage:
7.4 A @ 120 Vac;
3.7 A @ 240 Vac
Line Voltage:
44.4 A @ 120 Vac;
22.7 A @ 240 Vac
3.7 A @ 240 Vac;
7.4 A @ 120 Vac
22.7 A @ 240 Vac;
44.4 A @ 120 Vac
Product Number Application
Differential
Temperature Insulation Depth
Switching
Action Mounting Includes(F) (inch) (mm)
L8124A1007 High Limit Protection, Low
Limit and Circulation Control
High limit: 10 F fixed;
low limit: 10-25 F adj.
1 1/2 in. 38 mm — Vertical Mount 3 in. insertion well.
L8124A1015 High Limit Protection, Low
Limit and Circulation Control
High limit: 10 F fixed;
low limit: 10-25 F adj.
3 in. 76 mm — Vertical Mount 3 in. insertion well
and ground screw.
* L8124B1039 Triple Aquastat Relay with
High limit
High limit: 10 F fixed;
low limit: 10-25 F adj.
— — SPST: High &
Low Limit
Vertical Mount —
L8124C1003 Triple Aquastat Relay with
High limit
High limit: 10 F fixed;
low limit: 10-25 F adj.
— — SPST: High &
Low Limit
Horizontal —
L8124C1102 High Limit Protection, Low
Limit and Circulation Control
High limit: 10 F fixed;
low limit: 10-25 F adj.
1 1/2 in. to 3
in. less well.
38 mm to 76
mm less well
—Horizontal—
* L8124E1016 Triple Aquastat Relay with
High limit
High limit: 10 F fixed;
low limit: 10-25 F adj.
— — SPST: High &
Low Limit
Vertical Mount —
L8124G1020 Triple Aquastat Relay with
High limit
High limit: 10 F fixed;
low limit: 10-25 F adj.
— — SPST: High &
Low Limit
Vertical Mount —
L8124L1011 Triple Aquastat Relay with
High limit
High limit: 10 F fixed;
low limit: 10-25 F adj.
— — SPST: High &
Low Limit
Horizontal —
* TRADELINE models • SUPER TRADELINE models